These Leslie tone cabinets are designed for single-channel organs whose pedal range extends down into the lower frequencies. The sound is "separated" with the highs reproduced by a horn rotor and the lows reproduced by a bass rotor. Both the horn and bass rotors can be operated at two speeds : Fast (Tremolo) or Slow (Chorale). These models also features a traditional tube amplifier for the "warm tube" sound.

The Leslie 122XB has an 11-pin connector designed to interface directly with the Hammond XB-series and later instruments including the New B-3 and Portable New B-3.